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I took my 2004 Z71 Surb into the dealership for a check of the 4w drive light that was on. They told me it was encoder motor but I like they were not telling the truth. The code on the paper says C0327 is that the motor or the sensor? Please let me know thanks Gwen

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  • C0327 - Encoder Circuit Malfunction most likely the motor is bad but could be in the wiring as well.
  • Posted on Nov 13, 2010

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    Service 4w drive


    I had a similar. Problem with 2000 GMC Sierra. I had it scan,but no problem was detected. It turn out to be the selector switch for the 4x4 on the dashboard. I was informed by a friend at the dealership of the bulletin for this problem. But the dealership would not cover the problem since no recall has been issued yet. I did get the dealership to sell me the switch at cost, $43.00. Hope this helps.

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    4wd message light is on. GM dealer says I need to replace encoder motor. Is there anything I can do until I can afford to fix the problem? Is it safe to drive?


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    2004 silverado 4 wheel drive does not work, 4 wheel high button remains lit, will not change to any other button


    1. Inspect Transfer Case Control Module (TCCM) and encoder/motor wiring, terminal contact, grounds.

    2. Install updated TCCM calibration.

    3. Inspect for TCCM water intrusion.
    4. Replace transfer case encoder/motor. 1. Check voltage on pin A, Light Blue wire at the engage switch.

    2. The voltage should remain near 1.0v with no buttons pushed, compare to the value on the scanner when the problem happens.

    3. Back close to the switch by hand and check for a glitch.

    4. Wiggle tug test harnesses at the switch and TCCM.

    5. Check terminal to pin grip. could be your transfercase control module locater under drivers side of dash. or the encoder motor

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